Fix invalid control escape in RegExp.
Fix invalid control escape in RegExp.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

loki04/jerryscript,yichoi/jerryscript,slaff/jerryscript,zherczeg/jerryscript,martijnthe/jerryscript,tilmannOSG/jerryscript,slaff/jerryscript,slaff/jerryscript,bzsolt/jerryscript,bsdelf/jerryscript,jerryscript-project/jerryscript,gabrielschulhof/jerryscript,loki04/jerryscript,grgustaf/jerryscript,LaszloLango/jerryscript,gabrielschulhof/jerryscript,yichoi/jerryscript,LeeHayun/jerryscript,glistening/jerryscript,zherczeg/jerryscript,bsdelf/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,akosthekiss/jerryscript,LaszloLango/jerryscript,loki04/jerryscript,LaszloLango/jerryscript,robertsipka/jerryscript,zherczeg/jerryscript,yichoi/jerryscript,grgustaf/jerryscript,jack60504/jerryscript,bzsolt/jerryscript,robertsipka/jerryscript,dbatyai/jerryscript,bsdelf/jerryscript,zherczeg/jerryscript,LeeHayun/jerryscript,jerryscript-project/jerryscript,jack60504/jerryscript,grgustaf/jerryscript,glistening/jerryscript,akosthekiss/jerryscript,akosthekiss/jerryscript,grgustaf/jerryscript,bzsolt/jerryscript,bsdelf/jerryscript,tilmannOSG/jerryscript,loki04/jerryscript,jack60504/jerryscript,gabrielschulhof/jerryscript,martijnthe/jerryscript,tilmannOSG/jerryscript,bsdelf/jerryscript,bsdelf/jerryscript,slaff/jerryscript,LeeHayun/jerryscript,LaszloLango/jerryscript,glistening/jerryscript,bzsolt/jerryscript,dbatyai/jerryscript,martijnthe/jerryscript,gabrielschulhof/jerryscript,jack60504/jerryscript,LeeHayun/jerryscript,jack60504/jerryscript,loki04/jerryscript,glistening/jerryscript,tilmannOSG/jerryscript,robertsipka/jerryscript,martijnthe/jerryscript,slaff/jerryscript,grgustaf/jerryscript,jerryscript-project/jerryscript,jack60504/jerryscript,LaszloLango/jerryscript,martijnthe/jerryscript,glistening/jerryscript,jerryscript-project/jerryscript,tilmannOSG/jerryscript,dbatyai/jerryscript,loki04/jerryscript,LeeHayun/jerryscript,grgustaf/jerryscript,akosthekiss/jerryscript,dbatyai/jerryscript,glistening/jerryscript,yichoi/jerryscript,akosthekiss/jerryscript,yichoi/jerryscript,zherczeg/jerryscript,martijnthe/jerryscript,gabrielschulhof/jerryscript,robertsipka/jerryscript,robertsipka/jerryscript,robertsipka/jerryscript,bzsolt/jerryscript